Grandstream Networks HT502 User Manual page 53

Identity Header not Telkom SA or CBCOM.
SIP T1 Timeout T1 is an estimate of the round-trip time between the client and server
transactions.
If the network latency is high, select larger value for more reliable usage.
SIP T2 Interval Maximum retransmission interval for non-INVITE requests and INVITE
responses.
SIP Timer D Set the SIP Timer D. Default is 0.
DTMF Payload Type Sets the payload type for DTMF using RFC2833.
Preferred DTMF The HT502 supports up to 3 different DTMF methods including in-audio, via
RTP (RFC2833) and via Sip Info. The user can configure DTMF method in a
method
priority list.
Default is No. If set to No, the DTMF-relay tag in Accept Header is always
DTMF-RELAY Tag
Respect SIP INFO added in outbound INVITE. If set to Yes, it depends on if SIP INFO is chosen
in Preferred DTMF Method.
Disable DTMF Default is No. If set to yes, use above DTMF order without negotiation
Negotiation
DTMF via RFC2833 Send DTMF via RTP (According to RFC 2833).
DTMF via SIP INFO Send DTMF via SIP INFO message.
Send Flash Event Default is No. If set to yes, flash will be sent as DTMF event.
Enable Call Features Default is Yes. (If Yes, call features using star codes will be supported locally)
Offhook Auto-Dial This parameter allows users to configure a User ID or extension number that is
automatically dialed when off-hook. Only the user part of a SIP address needs
is entered here. The HT502 will automatically append the "@" and the host
portion of the corresponding SIP address.
Offhook Auto-Dial Configure the delay time for offhook auto-dial function. Range is 0-60 seconds,
HT502 User Manual
P a g e | 52